Labor contractions can be increased by the medical use of a synthetic drug that mimics the action of _____
A) inhibin
B) luteinizing hormone
C) oxytocin
D) prolactin
C
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As observed in animal stem cells, plant stem cells are able to
A. exist as mature cells. B. produce nutrients for other cells. C. remain undifferentiated but can divide to produce cells that generate new tissues. D. fight microbial invaders by becoming mobile and phagocytic.
Since the Industrial Revolution, the pH of the oceans has __________, making the water more
__________.
a. decreased; acidic b. decreased; basic c. increased; acidic d. increased; basic
What is the ultimate source of a new allele in a gene pool?
a. natural selection b. mutation c. gene flow d. genetic drift
On a hot, dry day a plant closes its stomata
thereby conserving water. Which plant hormone is responsible for the closing of the stomata?
a. auxin b. gibberellin c. ethylene d. cytokinin e. abscisic acid